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## org.bouncycastle.crypto.prng
Class X931SecureRandomBuilder

    java.lang.Object
      org.bouncycastle.crypto.prng.X931SecureRandomBuilder

public class X931SecureRandomBuilder
extends java.lang.Object

Constructor Summary
`X931SecureRandomBuilder()` Basic constructor, creates a builder using an EntropySourceProvider based on the default SecureRandom with predictionResistant set to false.
`X931SecureRandomBuilder(EntropySourceProvider entropySourceProvider)` Create a builder which makes creates the SecureRandom objects from a specified entropy source provider.
`X931SecureRandomBuilder(java.security.SecureRandom entropySource, boolean predictionResistant)` Construct a builder with an EntropySourceProvider based on the passed in SecureRandom and the passed in value for prediction resistance.

Method Summary
`X931SecureRandom` | `build(BlockCipher engine, KeyParameter key, boolean predictionResistant)` Construct a X9.31 secure random generator using the passed in engine and key.
`X931SecureRandomBuilder` | `setDateTimeVector(byte[] dateTimeVector)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### X931SecureRandomBuilder

    public X931SecureRandomBuilder()

  Basic constructor, creates a builder using an EntropySourceProvider based on the default SecureRandom with predictionResistant set to false.

  Any SecureRandom created from a builder constructed like this will make use of input passed to SecureRandom.setSeed() if the default SecureRandom does for its generateSeed() call.

### X931SecureRandomBuilder

    public X931SecureRandomBuilder(java.security.SecureRandom entropySource,
                                   boolean predictionResistant)

  Construct a builder with an EntropySourceProvider based on the passed in SecureRandom and the passed in value for prediction resistance.

  Any SecureRandom created from a builder constructed like this will make use of input passed to SecureRandom.setSeed() if the passed in SecureRandom does for its generateSeed() call.

Parameters:
  `entropySource` -
  `predictionResistant` -

### X931SecureRandomBuilder

    public X931SecureRandomBuilder(EntropySourceProvider entropySourceProvider)

  Create a builder which makes creates the SecureRandom objects from a specified entropy source provider.

  Note: If this constructor is used any calls to setSeed() in the resulting SecureRandom will be ignored.

Parameters:
  `entropySourceProvider` - a provider of EntropySource objects.

Method Detail

### setDateTimeVector

    public X931SecureRandomBuilder setDateTimeVector(byte[] dateTimeVector)

### build

    public X931SecureRandom build(BlockCipher engine,
                                  KeyParameter key,
                                  boolean predictionResistant)

  Construct a X9.31 secure random generator using the passed in engine and key. If predictionResistant is true the generator will be reseeded on each request.

  Parameters:
    `engine` - a block cipher to use as the operator.
    `key` - the block cipher key to initialise engine with.
    `predictionResistant` - true if engine to be reseeded on each use, false otherwise.
  Returns:
    a SecureRandom.

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